Boss battle is almost always Boss 3. We have it every night at 20:00 Game Time. If too few players show for the Boss Fight, we may substitute Boss 2. For Boss 3, try not to go over 34,800,001 points. That is the maximum to get 14,300 honor badges (higher scores still only get 14,300).
Some folks have asked when we will do Boss 4. That's a nightmare battle. Boss 4 cannot be stunned and has InstaDeath Skill. He has 800 million hit points (Boss 3 has 120 million). To win, do not use Stunners. You will need Treantaur ("Groot", for revive); Aries (to prevent Boss' Skill); definitely Pumpkin Duke, Cupid, Druid; and a tank. All heroes should have Revive - use Crests as needed. All that to get 2000 merits (and bragging rights). Oh, and he costs 1,000 guild credits for a single battle.